package com.hmall.trade.service.impl;

import com.baomidou.mybatisplus.core.toolkit.Wrappers;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmall.api.cart.CartClient;
import com.hmall.api.item.ItemClient;
import com.hmall.api.item.dto.ItemDTO;
import com.hmall.api.item.dto.OrderDetailDTO;
import com.hmall.common.constants.MqConstants;
import com.hmall.common.domain.dto.CartItemDeleteDTO;
import com.hmall.common.exception.BadRequestException;
import com.hmall.common.utils.UserContext;
import com.hmall.trade.domain.dto.OrderFormDTO;
import com.hmall.trade.domain.po.Order;
import com.hmall.trade.domain.po.OrderDetail;
import com.hmall.trade.mapper.OrderDetailMapper;
import com.hmall.trade.mapper.OrderMapper;
import com.hmall.trade.service.IOrderDetailService;
import com.hmall.trade.service.IOrderService;
import io.seata.spring.annotation.GlobalTransactional;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.AmqpException;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.core.MessagePostProcessor;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.stereotype.Service;


import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2023-05-05
 */
@Slf4j
@Service
@RequiredArgsConstructor
public class OrderServiceImpl extends ServiceImpl<OrderMapper, Order> implements IOrderService {

    private final ItemClient itemClient;
    private final IOrderDetailService detailService;
    private final CartClient cartClient;
    private final RabbitTemplate rabbitTemplate;
    private final OrderMapper orderMapper;
    private final OrderDetailMapper orderDetailMapper;

    /**
     * 创建订单
     *
     * @param orderFormDTO
     * @return
     */
    @Override
    @GlobalTransactional
    public Long createOrder(OrderFormDTO orderFormDTO) {
        // 1.订单数据
        Order order = new Order();
        // 1.1.查询商品
        List<OrderDetailDTO> detailDTOS = orderFormDTO.getDetails();
        // 1.2.获取商品id和数量的Map
        Map<Long, Integer> itemNumMap = detailDTOS.stream()
                .collect(Collectors.toMap(OrderDetailDTO::getItemId, OrderDetailDTO::getNum));
        Set<Long> itemIds = itemNumMap.keySet();
        // 1.3.查询商品
        List<ItemDTO> items = itemClient.queryItemByIds(itemIds);
        if (items == null || items.size() < itemIds.size()) {
            throw new BadRequestException("商品不存在");
        }
        // 1.4.基于商品价格、购买数量计算商品总价：totalFee
        int total = 0;
        for (ItemDTO item : items) {
            total += item.getPrice() * itemNumMap.get(item.getId());
        }
        order.setTotalFee(total);
        // 1.5.其它属性
        Long userId = UserContext.getUser();

        order.setPaymentType(orderFormDTO.getPaymentType());
        order.setUserId(userId);
        order.setStatus(1);
        // 1.6.将Order写入数据库order表中
        save(order);
        //发送延迟消息，订单超时未支付，自动取消订单
        rabbitTemplate.convertAndSend(MqConstants.DELAY_EXCHANGE_NAME, MqConstants.DELAY_ORDER_KEY, order,new MessagePostProcessor(){
            @Override
            public Message postProcessMessage(Message message) throws AmqpException {
                message.getMessageProperties().setDelay(10000);
                return message;
            }
        });


        // 2.保存订单详情
        List<OrderDetail> details = buildDetails(order.getId(), items, itemNumMap);
        detailService.saveBatch(details);

        // 3.清理购物车商品
        //cartClient.deleteCartItemByIds(userId,itemIds);

        // 清理购物车商品通过MQ

        //通过对象传递
        CartItemDeleteDTO cartItemDeleteDTO = new CartItemDeleteDTO();
        cartItemDeleteDTO.setUserId(userId);
        cartItemDeleteDTO.setItemIds(itemIds);
        //发送消息不用声明Queue，只需要Exchange，路由键和内容
        try {
            rabbitTemplate.convertAndSend(MqConstants.TRADE_EXCHANGE_NAME, MqConstants.ORDER_CREATE_KEY, cartItemDeleteDTO);
        } catch (AmqpException e) {
            log.error("发送购物车商品删除消息失败！", e);
        }

        // 4.扣减库存
        try {
            itemClient.deductStock(detailDTOS);
        } catch (Exception e) {
            throw new RuntimeException("库存不足！");
        }
      /*  if (true) {
            throw new RuntimeException("测试事务回滚");
        }*/
        return order.getId();
    }

    @Override
    public void markOrderPaySuccess(Long orderId) {
        Order order = new Order();
        order.setId(orderId);
        order.setStatus(2);
        order.setPayTime(LocalDateTime.now());
        updateById(order);
    }

    private List<OrderDetail> buildDetails(Long orderId, List<ItemDTO> items, Map<Long, Integer> numMap) {
        List<OrderDetail> details = new ArrayList<>(items.size());
        for (ItemDTO item : items) {
            OrderDetail detail = new OrderDetail();
            detail.setName(item.getName());
            detail.setSpec(item.getSpec());
            detail.setPrice(item.getPrice());
            detail.setNum(numMap.get(item.getId()));
            detail.setItemId(item.getId());
            detail.setImage(item.getImage());
            detail.setOrderId(orderId);
            details.add(detail);
        }
        return details;
    }

    // 取消订单,将订单中已经扣除的库存重新加回来
    @Override
    public void cancelOrder(Long orderId) {
        Order order = orderMapper.selectById(orderId);
        order.setStatus(5);
        orderMapper.updateById(order);
        // 3. 获取订单中的商品项（订单详情）
        // 使用 MyBatis Plus 根据 orderId 查询订单详情列表
        List<OrderDetail> details = orderDetailMapper.selectList(Wrappers.<OrderDetail>lambdaQuery().eq(OrderDetail::getOrderId, orderId));
        //TODO
        // 4. 构建库存恢复对象列表
    /*    List<StockDTO> stockDTOS = details.stream()
                .map(detail -> new StockDTO()
                        .setItemId(detail.getItemId())
                        .setStock(detail.getNum()))
                .collect(Collectors.toList());*/

    }
}
